I am using the rdiscount markdown which I installed using
$ gem install rdiscount
Building native extensions. This could take a while...
Successfully installed rdiscount-2.2.0.1
1 gem installed
But when I run my website locally it shows
$ bundle exec jekyll serve
...
Incremental build: disabled. Enable with --incremental
Generating...
Jekyll Feed: Generating feed for posts
Markdown processor: "rdiscount" is not a valid Markdown processor.
Available processors are: kramdown
Conversion error: Jekyll::Converters::Markdown encountered an error while converting '_posts/2014-05-10-this-is-a-sample.md':
Invalid Markdown processor given: rdiscount
ERROR: YOUR SITE COULD NOT BE BUILT:
------------------------------------
Invalid Markdown processor given: rdiscount
What is the issue and how to fix it?